Report of Missouri Farmers' Week. 



567 



the fruit does not take on the high finish in that respect that gen- 

 erally follows the use of lime-sulphur. On varieties that are 

 especially susceptible to bitter rot, such as Huntsman, Willow Twig, 

 Givens, Lansingburg and a few others, three or four applications 

 of standard Bordeaux mixture will sometimes be necessary to 

 effect a satisfactory control. The first application should be on 

 the trees at least by the first week in July. The other applications 

 should follow at intervals of two to three weeks, according to the 

 probable severity of infections. Some seasons in cases of moder- 

 ate severity, three, two, or possibly even a single application made 

 at exactly the right time may largely prevent loss from bitter rot. 



LEAF SPOTS, 



These are fungus diseases which occur on the foliage causing 



premature defoliation and to- 

 gether with the scab fungus are 

 probably responsible for the bar- 

 renness of many orchards. The 

 most common one, generally 

 known among growers as "frog- 

 eye," is due to the same or a 

 similar fungus to the one causing 

 black rot. These troubles not 

 only reduce the vigor of the trees 

 and cause the fruit to drop early, 

 but also seriously interfere with 

 the growth and maturity of fruit 

 buds. Leaf spots should be largely 

 controlled by the spraying neces- 

 sary to control scab and blotch. 



ILLINOIS CANKER OR BLISTER CANKER. 



Canker is a general term 

 used to designate diseased, rough- 

 ened patches of bark on the trunk 

 or branches of trees. There are 

 several kinds of canker to be found in Missouri orchards, but the 

 most common and most destructive is the one known as "Illinois 

 canker" or "blister canker." This disease was first brought to 

 notice by Hasselbring in 1902 after it had been doing serious dam- 



Leaf spot (frog eye). 



